| Abbreviation | Definition |
|---|---|
| RIA | Robotics Industries Association |
| RIBA | Rhode Island Broadcasters Association |
| RIBA | Rhode Island Builders Association |
| RIBA | Royal Institute of British Architects |
| RIBA-USA | Royal Institute of British Architects - United States of America |
| RIBB | River Industry Bulletin Board |
| RIBO | Rhode Island Building Owners and Managers |
| RICP | Retirement Income Certified Professional |
| RINI | Rhode Island Nurses Institute |
| RISE | Rheumatology Informatics System for Effectiveness |
| RIT | Return In Transit |
| RITST | Research Institute for Transportation Science and Technology |
| RIVMA | Rhode Island Veterinary Medical ASssociation |
| RL | Registered Landman |
| RLA | Reference Librarians Association |
| RMA | Radio Manufacturers Association |
| RMA | Rubber Manufacturers Association |
| RMAPS | Registered Member of the Association for Project Safety |
| RNA | Ripe Ncc Association |
| RNAO | Registered Nurses Association of Ontario |